John,
The switch is usually called the Thermo-Time Switch, and the heating coil warms up a bi-metallic strip with the moving contact of the break-action switch. After a few seconds the normally-closed contacts open ... if the switch contacts are not welded closed or stuck.
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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